Break Flex-on-Flex Connection from DCA-X

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""" This script demonstrates making a Flex-on-Flex connection
(from the PC) and then breaking Flex-on-Flex from the N1000A. The :RDCA subsystem command are used to create
Flex-on-Flex, and the :APPLication subsystem commands are used to
disconnect Flex-on-Flex.
"""
import pyvisa as visa  # import VISA library

FLEX_ADDRESS = 'TCPIP0::localhost::hislip0,4880::INSTR'
DCAX_ADDRESS = 'TCPIP0::K-N1000A-00240::hislip0,4880::INSTR'
DCAX_HOSTNAME = 'K-N1000A-00240'


def open_flexdca_connection(address):
    """ Opens visa connection to FlexFlexDCA. """
    print('Connecting to Flexdca ...')
    try:
        rm = visa.ResourceManager()
        connection = rm.open_resource(address)
        connection.timeout = 20000  # Set connection timeout to 20s
        connection.read_termination = '\n'
        connection.write_termination = '\n'
        inst_id = connection.query('*IDN?')
        print('\nFlexDCA connection established to:\n' + inst_id, flush=True)
    except (visa.VisaIOError, visa.InvalidSession):
        print('\nVISA ERROR: Cannot open instrument address.\n', flush=True)
        return None
    except Exception as other:
        print('\nVISA ERROR: Cannot connect to instrument:', other, flush=True)
        print('\n')
        return None
    return connection


def connect_FlexDCA_to_DCAX(FlexDCA, DCAX_HOSTNAME):
    """Opens connections from FlexDCA on PC to N1000A's FlexDCA. """
    print('Connecting to DCA-X. Please wait...', flush=True)
    FlexDCA.write(':RDCA:CONNect:METhod LAN')
    FlexDCA.write(':RDCA:CONNect:MODE STANdard')
    FlexDCA.write(':RDCA:CONNect:ACTion TBSettings')
    # Pull state upon connect
    FlexDCA.write(':RDCA:CONNect:TSETtings ON')
    # Push state upon disconnect
    FlexDCA.write(':RDCA:DISConnect:TSETtings ON')
    FlexDCA.write(':RDCA:CONNect:HOST "' + DCAX_HOSTNAME + '"')
    if FlexDCA.query(':RDCA:CONNect;*OPC?'):
        print(FlexDCA.query('*IDN?'))


def view_message():
    """ """
    print('-' * 20)
    s = 'Confirm that FlexDCA on the PC is now connected to the \
N1000A. FlexDCA on your PC should now be \
showing the DCA-X\'s screen.\n\nNote: In this mode, if you install \
a simulated module, it will be installed on FlexDCA on the PC not \
on the DCA-X.\
\n\nTo send a command to the DCA-X to disconnect from FlexDCA \
on the PC, press the Enter key:'
    input(s)


def disconnect_flex_on_flex(DCAX):
    s = DCAX.query('*IDN?')
    print('\nBreaking Flex-on-Flex from DCA-X:\n\t' + s, flush=True)
    if DCAX.query(':APPLication:CSTate?') in '1':
        s = DCAX.query(':APPLication:CNAMe?')
        print('\tConnection made by: ', s)
        DCAX.write(':APPLication:RDISconnect')
        print('\nFlex-on-Flex disconnected from DCA-X.')
    else:
        print('\nA Flex-on-Flex connection does not exist to this DCA-X.')
        print('Ending program.')


FlexDCA = open_flexdca_connection(FLEX_ADDRESS)
connect_FlexDCA_to_DCAX(FlexDCA, DCAX_HOSTNAME)
FlexDCA.write(':SYSTem:GTLocal')
view_message()
DCAX = open_flexdca_connection(DCAX_ADDRESS)
disconnect_flex_on_flex(DCAX)
DCAX.write(':SYSTem:GTLocal')
DCAX.close()
FlexDCA.write(':SYSTem:GTLocal')
FlexDCA.close()